Usage:
PB-10: Inspecting Electrical Connectors
System Operation
Deutsch Connectors
Functional Test
PB-11: ECM Battery Circuits Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PB-12: Throttle Position Sensor Circuit Test
System Operation
Schematic- +8V Pedal Mounted Throttle Position Sensor
Schematic- +12V Pedal Mounted Throttle Position Sensor for PTO
Schematic- Cylindrical Throttle Position Sensor- Used as Cab Throttle
ECM Pin Locations
Diagnostic Codes
Functional Test
PB-13: Check Engine, Warning Lamp, or PTO Switch On Lamp Circuit Test
System Operation
Schematic 1 - Lamp Circuits Without Eaton Top 2 Transmission
Schematic 2 - Lamp Circuits With Eaton Top 2 Transmission and Dedicated PTO
ECM Pin Locations
Functional Test
PB-14: Vehicle Speed Circuit Test
System Operation
Schematic 1 - Single Coil Speed Sensor with ECM Driving Speedometer (Recommended)
Schematic 2 - Single Coil Sensor for ECM, Second Single Coil Sensor for Speedometer
Schematic 3 - Dual Coil Vehicle Speed Sensor
Schematic 4 - Electronic Control Providing Vehicle Speed to Engine ECM
Schematic 5 - Data Link Driven Speedometer
ECM Pin Locations
Diagnostic Codes
Functional Test
Vehicle Speed Calibration And Adjustment
PB-15: Cruise Control and Kickout Switches Circuit Test
System Operation
Electronic Service Tool Cruise Control "Kickout" Status Screen Table
Electronic Service Tool Idle/PTO "Kickout" Status Screen Table
NOTE: Refer to "PB-16: Parking Brake or Multi-Function Input Switch Circuit Test" on page 138 for PTO/Multi-Function Input Wiring)
Schematic
ECM Pin Locations
Functional Test
PB-16: Parking Brake or Multi-Function Input Switch Circuit Test
System Operation
Electronic Service Tool Idle/PTO "Kickout" Status Screen Table
Schematic 1 - PTO Configuration Cab Switches
Schematic 2 - PTO Configuration Remote Switches
Schematic 3 - PTO Configuration Remote Throttle
Schematic 4 - PTO Configuration Cab Switches with Torque Limiting and Disabling Brake/Clutch Kickout of PTO Set Speed
Schematic 5 - PTO Configuration Remote Switches with Torque Limiting and Disabling Brake/Clutch Kickout of PTO Set Speed
Schematic 6 - Parking Brake Switch
Schematic 7 - PTO Configuration Cab Switches or Remote Switches with Torque Limiting and Disabling Brake/Clutch Kickout of Idle Set rpm without PTO installed
ECM Pin Locations
Functional Test
PB-17: Coolant Level Sensor Circuit Test
System Operation
Schematic
Schematic - Volvo GM Truck Chassis (If Equipped)
ECM Pin Locations
Diagnostic Codes
Functional Test
PB-18: Cooling Fan and A/C High Pressure Switch Circuits Test
System Operation
Schematic 1 - A/C High Pressure Switch Connected to ECM, Normally Open Electrical System
Conditions to Turn Fan ON for Schematic 1
Schematic 2 - A/C High Pressure Switch Not Connected to ECM, Normally Open Electrical System
Conditions to Turn Fan ON for Schematic 2
Schematic3 - A/C High Pressure Switch Connected to ECM, Normally Closed Electrical System
Conditions to Turn Fan ON for Schematic 3
Schematic 4 - A/C High Pressure Switch Not Connected to ECM, Normally Closed Electrical System
Conditions to Turn Fan ON for Schematic 4
Schematic 5 - A/C High Pressure Switch Connected to ECM, ECM Output Direct Connection
Conditions to Turn Fan ON for Schematic 5
Schematic 6 - A/C High Pressure Switch Not Connected to ECM, ECM Output Direct Connection
Conditions to Turn Fan ON for Schematic 6
Schematic 7 - A/C Control Unit Connected to ECM, ECM Output Direct Connection
Conditions to Turn Fan ON for Schematic 7
Schematic 8 - Three Speed Fan Connections
Conditions to Turn Fan ON for Schematic 8
Diagnostic Codes
Functional Test
PB-19: Auxiliary Brake, Engine Running Output, Shutdown Output Circuits Test
System Operation
ECM Pin Locations
Schematic 1 - Auxiliary Retarder Relay Circuit
Schematic 2 - Engine Running Output Circuit
Schematic 3 - Shutdown Output Circuit
Functional Test
PB-20: Retarder Solenoid Circuits Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PB-21: Idle Shutdown Timer and PTO Shutdown Timer Test
System Operation
Diagnostic Codes
Functional Test
PB-22: Tachometer Circuit Test
System Operation
Schematic 1 - ECM Driven Tachometer - Tachometer Output
Schematic 2 - ECM Driven Tachometer - J1587 ATA Data Link
ECM Pin Locations
Functional Test
PB-23: ATA (SAE J1587/1708) Data Link Circuit Test
System Operation
Schematic
ECM Pin Locations
Functional Test
PB-24: Powertrain Data Link Circuit Test
System Operation
NOTE: If the ECM Serial No. ends in "CD", refer to "PC-39: 3176B Truck Engines in Motorcoaches with 120-8974 ECM Test" on page 296 for the schematic.
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
Table 1: Electronic Service Tool Status Screen Definition Table
PB-25: Eaton Top 2 Transmission Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-30: ECM Memory Test
System Operation
Diagnostic Codes
Functional Test
PC-31: Engine Speed/Timing Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-32: Engine Timing Calibration
System Operation
Diagnostic Codes
Special Tools Required
Functional Test
PC-33: Injector Solenoids Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-34: +5V Sensor Voltage Supply Circuit Test
System Operation
Schematic 1 - Sensor Circuit With Outside Air Temperature Sensor Installed
Schematic 2 - Sensor Circuit Without Outside Air Temperature Sensor Installed
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-35: Engine Sensor Open or Short Circuit Test
System Operation
Schematic 1 - Sensor Circuit With Outside Air Temperature Sensor Installed
Schematic 2 - Sensor Circuit Without Outside Air Temperature Sensor Installed
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-36: Event Codes Test
System Operation
Diagnostic Codes
Functional Test
PC-37: Boost Sensor Calibration
System Operation
Diagnostic Codes
Functional Test
PC-38: Multi-Torque Test
System Operation
Functional Test
PC-39: 3176B Truck Engines in Motorcoaches with 120-8974 ECM Test
System Operation
Schematic
